Abstract
A sensitive inductively coupled plasma atomic emission spectrometric method for the determination of trace amounts of nickel after extraction of the metal into isobutyl methyl ketone (IBMK) containing 1,5-bis[phenyl(2-pyridyl)methylene]thiocarbonohydrazide (BPTH) is described. A systematic study was made to determine the optimum conditions for extraction of the metal into IBMK. The chief advantage of the method lies in the maximum allowable aqueous-to-organic phase volume ratio of 37. The detection and quantification limits for nickel were 0.3 and 1.1 ng ml–1, respectively, and the calibration is linear from 0.4 to at least 150 ng ml–1. The method has been used for the determination of nickel in various biological samples [mineralized by microwave digestion in sealed poly(tetrafluoroethylene) containers], as well as in human urine, with good results.
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